Results 161 to 170 of about 15,682 (213)

Quasi-cyclic generalized ldpc codes with low error floors [PDF]

open access: yesIEEE Transactions on Communications, 2008
In this paper, a novel methodology for designing structured generalized LDPC (G-LDPC) codes is presented. The proposed design results in quasi-cyclic G-LDPC codes for which efficient encoding is feasible through shift-register-based circuits.
Gianluigi Liva   +2 more
exaly   +3 more sources
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Enumerators for Protograph-Based Ensembles of LDPC and Generalized LDPC Codes

IEEE Transactions on Information Theory, 2011
Protograph-based LDPC and generalized LDPC (G-LDPC) codes have the advantages of a simple design procedure and highly structured encoders and decoders. The design of such “protograph-based codes” relies on what is effectively a computer-based search. As such, following Gallager, it is prudent to restrict the search to a “good ensemble,” for example, an
Dariush Divsalar   +2 more
exaly   +2 more sources

Irregular LDPC codes as concatenation of regular LDPC codes

IEEE Communications Letters, 2005
In this letter, the construction of irregular LDPC codes obtained by concatenating regular ones is considered. These codes are analyzed for the binary symmetric channel (BSC). It is shown via proper distribution evolution that such concatenated codes have in general a threshold value weaker (but not necessarily much different) than their unconstrained ...
Marc P. C. Fossorier, Nenad Miladinovic
openaire   +2 more sources

Overview of LDPC Codes

7th IEEE International Conference on Computer and Information Technology (CIT 2007), 2007
In light of the history of LDPC codes and relevant research advances in recent years, this paper probes into the encoding and decoding techniques related to this capacity-approaching error-correction technology. Besides the general expression as an equation, LDPC codes can also be examined with a Tanner graph.
Zongjie Tu, Shiyong Zhang
openaire   +2 more sources

Comprehensive Study on CC-LDPC, BC-LDPC and Polar Code

2020 IEEE Wireless Communications and Networking Conference Workshops (WCNCW), 2020
Channel coding scheme is very crucial for the next sixth generation (6G) mobile communication. In this paper, we investigate the encoding and decoding methods of the state-of-the-art channel codes, which include the convolutional code LDPC (CC-LDPC), block code LDPC (BC-LDPC) and polar code to access the benefits from CC-LDPC.
Kun Zhu 0013, Zhanji Wu
openaire   +2 more sources

Deriving Good LDPC Convolutional Codes from LDPC Block Codes [PDF]

open access: yesIEEE Transactions on Information Theory, 2011
Low-density parity-check (LDPC) convolutional codes are capable of achieving excellent performance with low encoding and decoding complexity. In this paper we discuss several graph-cover-based methods for deriving families of time-invariant and time-varying LDPC convolutional codes from LDPC block codes and show how earlier proposed LDPC convolutional ...
Roxana Smarandache   +2 more
exaly   +4 more sources

Block-LDPC: a practical LDPC coding system design approach

IEEE Transactions on Circuits and Systems Part 1: Regular Papers, 2005
This paper presents a joint low-density parity-check (LDPC) code-encoder-decoder design approach, called Block-LDPC, for practical LDPC coding system implementations. The key idea is to construct LDPC codes subject to certain hardware-oriented constraints that ensure the effective encoder and decoder hardware implementations.
Hao Zhong 0006, Tong Zhang 0002
exaly   +3 more sources

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